Porosity and Oxide Layer Dependence of Thermal Shock Behavior of Porous Silicon Nitride Ceramics  

作　　者：Xuefeng Lu Yin Wei Hongjie Wang Jiangbo Wen Jun Zhou Jinpeng Fan 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University [2]National Key Laboratory of Advanced Functional Composite Materials

出　　处：《Journal of Materials Science & Technology》2014年第12期1217-1222,共6页材料科学技术（英文版）

基　　金：financial support of the project from the National Natural Science Foundation of China (Nos. 51272206 and 51472198);the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1280);the National Key Laboratory Functional Composite (No. 9140C560109130C56201);the Fundamental Research Funds for the Central University (No. xkjc2014009);the State Key Laboratory for Mechanical Behavior of Materials (No. 20121207)

摘　　要：A water-quenching technique has been adopted to evaluate thermal shock fracture and fatigue behaviors of porous Si3N4 ceramics in an air atmosphere. The high-porosity Si3N4 ceramics exhibit a higher strength retention and a better resistance to thermal shock fatigue because of its role of the pores as crack arresters.A dense and coherent surface oxide layer leads to a significant benefit in residual strength during thermal fatigue, however, an increased fatigue number to 30 th cycle cannot cause a further influence although a thicker oxide layer presents, which is attributed to holes defect and disappearance of part intergranular phase.A water-quenching technique has been adopted to evaluate thermal shock fracture and fatigue behaviors of porous Si3N4 ceramics in an air atmosphere. The high-porosity Si3N4 ceramics exhibit a higher strength retention and a better resistance to thermal shock fatigue because of its role of the pores as crack arresters.A dense and coherent surface oxide layer leads to a significant benefit in residual strength during thermal fatigue, however, an increased fatigue number to 30 th cycle cannot cause a further influence although a thicker oxide layer presents, which is attributed to holes defect and disappearance of part intergranular phase.

关 键 词：Porous silicon nitride ceramics Oxide layer Thermal shock behavior Thermal fatigue 

分 类 号：TQ174.1[化学工程—陶瓷工业]